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    SubjectRe: [PATCH 3/9] mm: introduce api for split page table lock for PMD level
    On Fri, Sep 13, 2013 at 04:06:10PM +0300, Kirill A. Shutemov wrote:
    > Basic api, backed by mm->page_table_lock for now. Actual implementation
    > will be added later.
    >
    > Signed-off-by: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
    > Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
    > ---
    > include/linux/mm.h | 13 +++++++++++++
    > 1 file changed, 13 insertions(+)
    >
    > diff --git a/include/linux/mm.h b/include/linux/mm.h
    > index 6cf8ddb..d4361e7 100644
    > --- a/include/linux/mm.h
    > +++ b/include/linux/mm.h
    > @@ -1294,6 +1294,19 @@ static inline void pgtable_page_dtor(struct page *page)
    > ((unlikely(pmd_none(*(pmd))) && __pte_alloc_kernel(pmd, address))? \
    > NULL: pte_offset_kernel(pmd, address))
    >
    > +static inline spinlock_t *huge_pmd_lockptr(struct mm_struct *mm, pmd_t *pmd)
    > +{
    > + return &mm->page_table_lock;
    > +}
    > +
    > +
    > +static inline spinlock_t *huge_pmd_lock(struct mm_struct *mm, pmd_t *pmd)
    > +{
    > + spinlock_t *ptl = huge_pmd_lockptr(mm, pmd);
    > + spin_lock(ptl);
    > + return ptl;
    > +}

    Why not call the thing pmd_lock()? The pmd bit differentiates it from
    pte_lock() enough IMIO.


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